S Crucis
# S Crucis

S Crucis is a star in the constellation Crux. A Cepheid variable, its apparent magnitude ranges from 6.22 to 6.92 over 4.68997 d. It is a yellow-white supergiant that pulsates between spectral types F6Ib-II and G1Ib-II.

S Crucis is a pulsating variable star of the δ Cephei type, a Classical Cepheid variable. Its mean radius is 37.9 $R_☉$ and that radius varies by up to 4.1 $R_☉$ during its 4.7-day pulsation cycle. Over the same cycle, the effective temperature varies between 5,517 K and 6,482 K. The star is thought to be 116 million years old; it has exhausted its core hydrogen and left the main sequence.

